Vue头像处理方案小结

<template>
  // 外面要给一个div并且限制宽度和高度，text-align center，overflow hidden
  <div class="head">
    // userInfoList.avatar 是后台返回给我的头像URL
    <img v-lazy="userInfoList.avatar" id="userhead" alt=""/>  
  </div>
  <div class="fl" v-for="(item, index) in matchList" :key="index">
    <div class="heads">
      <img v-lazy="item.adatar" class="headitem" alt=""/>
    </div>
  </div >
</template>
<script>
import { head, heads } from '@/assets/js/base'  // 存放head，heads目录引入
export default {
data(){
 return {
   listQuery:{
     pg: 1,
     ps: 10
  }
},
methods:{
  //获取用户详情
  getUserInfoList(){
   getlist('mobile/user/pers/detail', funciton(res) {
     if(data.code == ERR_OK){
        _this.userInfoList = res.data
        // 单个头像处理，$nextTick处理去报 数据加载完成后 在进行图
        _this.$nextTick(function () { 
           head(res.data.avatar, 'userhead')
        })
        // 下拉加载多个头像处理
        res.data.item.forEach((item, index) => {
          if(_this.listQuery.pg>1){ // 下拉加载时，头像依然要进行处理
             let count = (10*(_this.listQuery.pg -1) + index)
             _this.$nextTick(function () {
                heads(item.adatar, count, 'headitem')
             })
          }else{
            _this.$nextTick(function () {
               heads(item.adatar, index, 'headitem')
            })
          }
        } 
      _this.listQuery.pg++
    }
  })
 }

// 单个头像处理
export function head (objUrl, id) {
   let _userhead = document.getElementById(id)
   if(_userhead){
      if(objUrl){
        let img = new Image()
        img.src = objUrl
        img.onload = function () {
            let _width = img.width
            let _height = img.height
            if(_width >= _height){
              _userhead.style.width = '100%'
           }else{
              _userhead.style.height = '100%'
            }
        }
      }else{
         _userhead.style.width = '100%'
      }
   }
}
// 多个头像处理
export function heads (objUrl, index, className) {
    let _heads = document.getElementsByClassName(className)[index]
    if(_heads){
      if(objUrl){
        let img = new Image()
        img.src = objUrl
        img.onload = function () {
           let _width = img.width
           let _height = img.height
           if(_width >= _height){
              _heads.style.width = '100%'
           }else{
             _heads.style.height = '100%'
           }
       }
     }else{
         _heads.style.width = '100%'
     }
  }
}